A recent bird flu outbreak at a California duck farm has raised concerns, with the highly pathogenic strain H5N9 discovered among sick birds. This incident, reported by U.S. authorities through ...

A new strain of bird flu (highly pathogenic avian influenza, or HPAI) has been detected on a duck farm in California. The World Organisation for Animal Health (WOAH) reported the outbreak of the new ...

The World Organization for Animal Health said in a Jan. 27 notification that the H5N9 strain of avian bird flu has been detected for the first time at a duck farm in Merced County, California.

We talked to experts about where the science is on risks to humans and how the virus is messing with the food supply.

Editor's note: This page reflects news from Wednesday, Feb. 12. For the latest updates on the atmospheric river in California, read USA TODAY's coverage for Thursday, Feb. 13. SAN DIEGO ...

H5N9, was found in California. These developments are precisely what many public health officials have been most concerned about as it means that bird flu is transforming in a way that could allow ...